An assembly of devices intended to be used to noninvasively detect, measure, and display bio-magnetic signals produced by electrically-active brain tissue, and to provide diagnostic information about the location of the active tissue responsible for cognitive brain functions relative to the surrounding brain anatomy [magnetoencephalography (MEG)]. It consists of a movable gantry, patient support apparatus, dewar [vessel containing liquid helium (He)], dedicated software, and a superconducting quantum interference device (SQUID) sensor array that measures the magnetic fields created by neuronal electrical currents. It is typically sited within a magnetically-shielded room (MSR).